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sched/fair: Introduce {en,de}queue_load_avg()
Analogous to the existing {en,de}queue_runnable_load_avg() add helpers
for {en,de}queue_load_avg(). More users will follow.
Includes some code movement to avoid fwd declarations.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
Ingo Molnar
parent
b5b3e35f41
commit
8d5b9025f9
@ -2692,6 +2692,90 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
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cfs_rq->nr_running--;
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}
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/*
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* Signed add and clamp on underflow.
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*
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* Explicitly do a load-store to ensure the intermediate value never hits
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* memory. This allows lockless observations without ever seeing the negative
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* values.
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*/
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#define add_positive(_ptr, _val) do { \
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typeof(_ptr) ptr = (_ptr); \
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typeof(_val) val = (_val); \
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typeof(*ptr) res, var = READ_ONCE(*ptr); \
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\
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res = var + val; \
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\
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if (val < 0 && res > var) \
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res = 0; \
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\
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WRITE_ONCE(*ptr, res); \
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} while (0)
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/*
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* Unsigned subtract and clamp on underflow.
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*
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* Explicitly do a load-store to ensure the intermediate value never hits
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* memory. This allows lockless observations without ever seeing the negative
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* values.
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*/
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#define sub_positive(_ptr, _val) do { \
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typeof(_ptr) ptr = (_ptr); \
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typeof(*ptr) val = (_val); \
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typeof(*ptr) res, var = READ_ONCE(*ptr); \
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res = var - val; \
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if (res > var) \
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res = 0; \
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WRITE_ONCE(*ptr, res); \
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} while (0)
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#ifdef CONFIG_SMP
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/*
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* XXX we want to get rid of this helper and use the full load resolution.
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*/
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static inline long se_weight(struct sched_entity *se)
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{
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return scale_load_down(se->load.weight);
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}
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static inline void
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enqueue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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cfs_rq->runnable_load_avg += se->avg.load_avg;
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cfs_rq->runnable_load_sum += se_weight(se) * se->avg.load_sum;
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}
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static inline void
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dequeue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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sub_positive(&cfs_rq->runnable_load_avg, se->avg.load_avg);
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sub_positive(&cfs_rq->runnable_load_sum, se_weight(se) * se->avg.load_sum);
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}
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static inline void
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enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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cfs_rq->avg.load_avg += se->avg.load_avg;
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cfs_rq->avg.load_sum += se_weight(se) * se->avg.load_sum;
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}
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static inline void
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dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg);
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sub_positive(&cfs_rq->avg.load_sum, se_weight(se) * se->avg.load_sum);
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}
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#else
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static inline void
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enqueue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
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static inline void
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dequeue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
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static inline void
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enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
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static inline void
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dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
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#endif
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#ifdef CONFIG_FAIR_GROUP_SCHED
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# ifdef CONFIG_SMP
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/*
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@ -3084,14 +3168,6 @@ ___update_load_avg(struct sched_avg *sa, unsigned long weight, struct cfs_rq *cf
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sa->util_avg = sa->util_sum / divider;
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}
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/*
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* XXX we want to get rid of this helper and use the full load resolution.
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*/
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static inline long se_weight(struct sched_entity *se)
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{
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return scale_load_down(se->load.weight);
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}
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/*
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* sched_entity:
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*
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@ -3141,26 +3217,6 @@ __update_load_avg_cfs_rq(u64 now, int cpu, struct cfs_rq *cfs_rq)
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return 0;
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}
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/*
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* Signed add and clamp on underflow.
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*
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* Explicitly do a load-store to ensure the intermediate value never hits
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* memory. This allows lockless observations without ever seeing the negative
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* values.
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*/
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#define add_positive(_ptr, _val) do { \
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typeof(_ptr) ptr = (_ptr); \
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typeof(_val) val = (_val); \
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typeof(*ptr) res, var = READ_ONCE(*ptr); \
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\
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res = var + val; \
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\
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if (val < 0 && res > var) \
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res = 0; \
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\
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WRITE_ONCE(*ptr, res); \
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} while (0)
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#ifdef CONFIG_FAIR_GROUP_SCHED
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/**
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* update_tg_load_avg - update the tg's load avg
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@ -3405,23 +3461,6 @@ static inline void set_tg_cfs_propagate(struct cfs_rq *cfs_rq) {}
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#endif /* CONFIG_FAIR_GROUP_SCHED */
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/*
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* Unsigned subtract and clamp on underflow.
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*
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* Explicitly do a load-store to ensure the intermediate value never hits
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* memory. This allows lockless observations without ever seeing the negative
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* values.
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*/
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#define sub_positive(_ptr, _val) do { \
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typeof(_ptr) ptr = (_ptr); \
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typeof(*ptr) val = (_val); \
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typeof(*ptr) res, var = READ_ONCE(*ptr); \
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res = var - val; \
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if (res > var) \
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res = 0; \
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WRITE_ONCE(*ptr, res); \
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} while (0)
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/**
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* update_cfs_rq_load_avg - update the cfs_rq's load/util averages
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* @now: current time, as per cfs_rq_clock_task()
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@ -3484,8 +3523,7 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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se->avg.last_update_time = cfs_rq->avg.last_update_time;
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cfs_rq->avg.load_avg += se->avg.load_avg;
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cfs_rq->avg.load_sum += se_weight(se) * se->avg.load_sum;
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enqueue_load_avg(cfs_rq, se);
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cfs_rq->avg.util_avg += se->avg.util_avg;
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cfs_rq->avg.util_sum += se->avg.util_sum;
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set_tg_cfs_propagate(cfs_rq);
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@ -3503,9 +3541,7 @@ static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
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*/
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static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg);
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sub_positive(&cfs_rq->avg.load_sum, se_weight(se) * se->avg.load_sum);
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dequeue_load_avg(cfs_rq, se);
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sub_positive(&cfs_rq->avg.util_avg, se->avg.util_avg);
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sub_positive(&cfs_rq->avg.util_sum, se->avg.util_sum);
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set_tg_cfs_propagate(cfs_rq);
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@ -3547,22 +3583,6 @@ static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
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update_tg_load_avg(cfs_rq, 0);
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}
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/* Add the load generated by se into cfs_rq's load average */
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static inline void
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enqueue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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cfs_rq->runnable_load_avg += se->avg.load_avg;
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cfs_rq->runnable_load_sum += se_weight(se) * se->avg.load_sum;
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}
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/* Remove the runnable load generated by se from cfs_rq's runnable load average */
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static inline void
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dequeue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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sub_positive(&cfs_rq->runnable_load_avg, se->avg.load_avg);
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sub_positive(&cfs_rq->runnable_load_sum, se_weight(se) * se->avg.load_sum);
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}
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#ifndef CONFIG_64BIT
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static inline u64 cfs_rq_last_update_time(struct cfs_rq *cfs_rq)
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{
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@ -3649,10 +3669,6 @@ static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
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cfs_rq_util_change(cfs_rq);
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}
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static inline void
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enqueue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
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static inline void
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dequeue_runnable_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
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static inline void remove_entity_load_avg(struct sched_entity *se) {}
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static inline void
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